Improvement in sewing-machines



S.VC. BLODGETT. v

Sewing Machine.

No. 15,469. K' Patented Aug. 5,' 1856.

, )MVr/vra@ jwzgwm Mew UNITED ,STATES ATENT UFFICE.

SHERBURN C. BLODGETT, OF-PHILADELPIIIA, PENNSYLVANIA.

IMPROVEMENT IN SEWING-IVIACHINES.

Speciiication forming part of Letters Patent No. 15,469,1lated August 5, lS-; antedaed February 5, 1856.

0 (LZZ whom it may concern:

' Beit known that I, SHERBURN G. BLoD- GETT, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have -invented a new and useful Improvement in Sewing-Machines; and I do hereby declare that the followingis ai'ull, clear, andeXact description of the same, reference being had to the annexed drawings, making apart of this speciiic'ation, in which Figure l isla perspective View of my improved machine with the top plate. removed. Fig. 2 is a view of thetop plateinverted. Fig. 3 is a vertical transverse section with the top plate in place. Fig. 4 is a view of the lower side of the shuttle. Fg; 5 is a top View of the cup or dish in which the shuttle rotates.

-Similar letters refer to like parts.

In thev accompanying drawings, B, Figs. l and 3, is aloose pulley in one solid piece. extending from the shuttle-cup to the bottom plate for driving all of the machinery, on the surface of which are wrought the following `ive parts, viz: a, the groovefor the driving-band; b, the crank or eccentric inclosed by connecting-rods; e, cam for depressing the pressurepad; c and c', cams for moving the feed-slide. On the top of the loose pulley are four shuttlc-drivers, d l d d, and their springs d d d d clasping the-shuttle.

y On top of the shaft C C is a shallow metallic dish or plate, which I call the shuttle-cup 7 c c. A, Fig. l, is bottom plate, with posts at its four corners.

E is the needle-arm, and E the connectingrod which works the needle-arln. H is the arm of the pressure-pad, and H is the connecting-rod which works the pressure-pad arm. s is a joint in the pad-arm.. t is a shuttlev spool. iis a hole for the delivery of the shut- The relative situation of the needle and' l shuttle and pressure-pad is similar to other approved sewing-machines. The needle has seven-eighths inch crank motion. The length of bed-plate is seven inches; height of bed-l plate, three inches; length of needle-arm, ve `and one-quarter inches. The needle-arm has its fulcruln near the top of the back parts and extends its shank down two inches, united to it by a universal joint to the connecting-rod; diameter across the disk ofthe shuttle, one and one-half inches; thickness of the same, sevensixteenths inch. The needle is placed at the left of shuttle, as in Figs 1 and 3. lThe cloth feeds from left to right.

The nature of my invention consists in the application of the following new parts or combinations: The shuttle is nearly in the form forming a heel andL point, as at g, Fig. 4, and

is of such proportion that it more than iills the loop of the needle-thread, and thus the shuttle draws the last stitch tight, and also draws thread from the spool for the next stitch while the needle is up, after which the thread is slack around the' shuttle and is held in the crimping-notch g, (which is deepest on the under side,) so as to draw it away from the needle-passage, and thus the shuttle cannot enter it a second time. By this mode of tightening the stitchthe cloth feeds much easier, and is not drawn into the small slot intended for the outlet of the stitches before they are drawn tight into the cloth. The hole for the delivery of the shuttle-thread is one-sixteenth of an inch (more or less) from the center of the shuttle, and its direction is from the heel 'of the shuttle, in order to draw the thread from the shuttle when the needle is down. 'Other- Wise this thread might be too tight in the seam.

The shaft C C stands firm in a socket in the` bed-plate, solid, on the top of which is the shallow shuttle-cup c" c, the top of which is two and three-eighths inches above the bedplate, and ts .around the shuttle as high as the driver-holes.` On the edge at the left is a cannf, for raising the drivers out of the holes in the shuttle as they pass the needle, and in the center of said cam is a lole for the passage of the needle. The driving-pawls d d d d are arranged around and operate in corresponding holes in the periphery of the shuttle, so as to act upon all parts of the shuttle alike,

in Order to prevent wear of the shuttle against draw itaway from the needle-passage, so that the sides of the cup, and they also keep the the shuttle may not take it asecond time. The

shuttle perfectly in place while one of the four pawls is successively removed from the shuttle by the cam f, in order to pass by the neef dle and return to its place, and thus the wear of the shuttle is prevented and it is securely retained in its bed or cup. As the arms of the pressure-pad are s olid in one piece and held down by a cam, it is necessary to have a joint at s to unbutton when it is required to raise the pad high above the cloth. A semicircular stud partly surrounds the needle-passage in the top-plate a-s high as' the top of the toothed slide, and protects the needle from the effects of the backward motion of the said slide.

The guide-fingers on are placed on each side of the needle-passage, and correspond with and lit into the groove around the shuttle. They also serve to present a good loop to the needle, and also to hold back the same thread as the shuttle is passing through the loop. Otherwise the loop might go around with the shuttle. The shuttle fits loose in its cup, and also in the top plate quite up to the sheetmetal cover. The inside of the shuttle-cup r is carved away to make room for the thread to pass under the shuttle. The sheet-metal cover must be carved away in a similar manner and the shuttle filed away a little on top at t, to let the loop draw up without being pinched between the shuttle and cover.

Thefeed-slide is supported in the top plate at the left of the needle, and extends on each side of the needle three-eighths of an inch to the right, thus taking hold of the cloth where the stitches arein vthe seam, and has only a forward and backward motion by means of two cams, c and c', one, c', operating on the lever to move it forward, and c on the slide- 'pin to move it back, and `Jthus the feed-plate requires no spring. l

The mode of operation is as follows: rlhe needle passes down through the cloth in the usual manner. Near the commencement of its upward motion it presents a loop of thread between the guide-fingers which the shuttle enters. As the needle performs its down and upward motion in the same time that the shut.- tle performs one revolution, the needle will be up at the same time the shuttle is half tlirough the loop. When the needle is down the second time, the shuttle has finished its course through the loop, except that it retains the thread in the crimping-notch g, in order to driving-pawls as they successively pass by the needle are removed out of its way by the cam of the shuttle through the next succeeding loop. The pressure-pad is forced down upon -the cloth during the upward motion of the needle and forward motion of the plate K, and is relaxed during the backward motion of the plate, leaving the cloth free to turn on the needle in sewing curves. The feedslide,with its teeth against the cloth, is moved forward by the cam c and the lever k while the needle is out of the cloth and rising, and is immediately afterward returned by the cam c before the needle rises and while the pressure-pad 1s up.

The cam j' may be limited to that portion of the circumference of the shuttle-cup opposite the needle, or it may continue its eccentricity to a greater or less extent around the shuttlecup.

Having thus described my improvement, what I claim as my invention, and desire to secure by Letters Patent. is-

1. The arrangement of the crimping-notch g in the shuttle for the purpose of drawing the slack thread from the needle, and thus preventing the loop of thread from being taken.

up a second time, as above described.

2. The employment of a series of pawls or drivers around the circumference of a discoidal or circular shuttle, whereby the drivingforce is applied equally, or nearly so, through a considerable arc of the circumference of such shuttle.

3. The mode of driving the disk-shuttle at its circumference by means of a hollow pulley or sleeve, B, revolving around afixed shaft or axis, C.

4. The mode of giving motion to the. needlearm an d feed-rollers by direct connection with the same sleeve or revolving shaft to which the drivers are attached, which drive the diskshuttle, substantially as abovel described.

5. The arrangement of the cams c and c and lever k for operating the slide k, in combination with the cam e and arm H, for'operating the pressure-pad, in the manner and for the purpose as hereinbefore described.

SHERBURN C. BLODGETT.

Vitnesses:

ALFRED C. GowEN, JOHN H. B. JENKINS.

The first loop is drawn up by the passage 

